Chapter 5 Pgs. 167-192.

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Presentation transcript:

Chapter 5 Pgs. 167-192

Recognize the difference between the scientific and layman definitions of work. Define work by relating it to force and displacement. Identify where work is being performed in a variety of situations. Calculate the net work done when many forces are applied to an object.

Work Work tells us how much a force or combination of forces changes the energy of a system. Work is the bridge between force (a vector) and energy (a scalar).

Work (W) Work is done on an object when a force is applied and the object moves W = Fd Unit for work: kg•m2/s2 or Joule (J) SI System: Joule (N m) 1 Joule of work is done when 1 N acts on a body moving it a distance of 1 meter

Work is done only when the components of a force are parallel to a displacement There is no work done by a force if it does not cause displacement W = Fd(cosΘ) Wnet = Fnetd(cosΘ)

Work is a scalar quantity Can be positive or negative Positive if your applied force and direction of movement are the same Ex. Pushing a vacuum Pulling a wagon

Negative if your applied force is opposite of the direction of movement Ex. Pushing against a remote control car that is going forward Pulling against a remote control car that is going in the opposite direction Friction does negative work on an object

Force Types Conservative forces – related to potential energy changes and is path independent Non-conservative forces – not related to potential energy changes and is path dependent

How much work is done on a vacuum cleaner pulled 3 How much work is done on a vacuum cleaner pulled 3.0 m by a force of 50.0 N at an angle of 30.0° above the horizontal?

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